Highschool is a once in a lifetime experience, do not waste it! ...That zealous teacher has returned!

In the first episode, two characters are introduced. Hayato and Odagiri. Hayato is the leader of class and childhood friend of Odagiri. For some reason, Hayato and Odagiri fought and now Odagiri Ryu quit school and is now working to some dangerous guy. Odagiri refuses to go to school as well. How will Yankumi bring back her precious student back to school?